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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'kaslrseed' command takes bytes from the hardware random number
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* generator and uses them to set the kaslr-seed value in the chosen node.
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*
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* Copyright (c) 2021, Chris Morgan <macromorgan@hotmail.com>
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <hexdump.h>
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#include <malloc.h>
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#include <rng.h>
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#include <fdt_support.h>
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static int do_kaslr_seed(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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size_t n = 0x8;
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struct udevice *dev;
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u64 *buf;
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int nodeoffset;
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int ret = CMD_RET_SUCCESS;
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if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
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printf("No RNG device\n");
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return CMD_RET_FAILURE;
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}
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buf = malloc(n);
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if (!buf) {
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printf("Out of memory\n");
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return CMD_RET_FAILURE;
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}
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if (dm_rng_read(dev, buf, n)) {
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printf("Reading RNG failed\n");
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return CMD_RET_FAILURE;
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}
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if (!working_fdt) {
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printf("No FDT memory address configured. Please configure\n"
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"the FDT address via \"fdt addr <address>\" command.\n"
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"Aborting!\n");
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return CMD_RET_FAILURE;
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}
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ret = fdt_check_header(working_fdt);
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if (ret < 0) {
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printf("fdt_chosen: %s\n", fdt_strerror(ret));
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return CMD_RET_FAILURE;
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}
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nodeoffset = fdt_find_or_add_subnode(working_fdt, 0, "chosen");
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if (nodeoffset < 0) {
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printf("Reading chosen node failed\n");
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return CMD_RET_FAILURE;
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}
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ret = fdt_setprop(working_fdt, nodeoffset, "kaslr-seed", buf, sizeof(buf));
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if (ret < 0) {
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printf("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(ret));
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return CMD_RET_FAILURE;
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}
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free(buf);
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return ret;
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}
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U_BOOT_LONGHELP(kaslrseed,
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"[n]\n"
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" - append random bytes to chosen kaslr-seed node\n");
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U_BOOT_CMD(
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kaslrseed, 1, 0, do_kaslr_seed,
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"feed bytes from the hardware random number generator to the kaslr-seed",
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kaslrseed_help_text
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);
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